Be able disable task detection from tasks.json or override tasks execution

Currently VSCode uses `tasks.json` to detect the tasks. If there is a `FileSystemProvider` registered, it will use it to read `tasks.json`. The problem with that is the tasks may not make sense if they come from something else other than `file:/.../.vscode/tasks.json`. E.g. if the file system provider is of a remote kind (like fetching files from sftp or Live Share), tasks from `tasks.json` most likely won't work locally. To deal with this scenario, VSCode may provide different options: 1. An ability to override task execution for any tasks from `tasks.json`. This work may be merged into #33523. VSCode should pass along the URI of the original `tasks.json` to the extension code that overrides the task execution. 1. An ability to disable tasks detection from `tasks.json` based on the file scheme. This will be a new API. Alternatively, you can make VSCode respect `tasks.json` only from `file:` scheme and let the extensions opt in other schemes if they so chose.